import sys

#
# str = sys.stdin.readline()
# print(str)
#
# num = input("请输入第一个数字:")
# print(num)
#
# sys.stdout.write('Hello')
# print('world')

# file = open('a.txt', 'r', buffering=1)
# print(file.read())
# file.close()

# with open('a.txt', 'r',encoding='utf-8', buffering=1) as file2:
    # \n
    # print(file2.readline())
    # print(file2.readline())
    # print(file2.readlines()) # 返回一个列表

    # list []  turple ()
    # set {1,2,3}  dict {}

# a 模式 代表追加写入
with open('a.txt', 'a',encoding='utf-8', buffering=1) as file3:
    file3.write('1111hello')